The limits associated with the use of linear momentum procedures in impact speed predictions of two-car collisions are well established. A combined linear and rotational momentum procedure is introduced which makes it possible to compute the impact speeds of each vehicle based on the post crash data of only one vehicle, or based on only the angles rotated of each vehicle. The limitations of the combined procedure are discussed. A speed sensitivity analysis is presented which offers a methodology by which reasonably accurate speed predictions can be made. A number of actual computer applications are shown which demonstrates the usefulness and simplicity of the procedure presented.